Flat panel speaker



FIG. 1 is a rear view of a flat panel speaker showing my new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a left side view thereof,

FIG. 5 is a first rear perspective view thereof;

FIG. 6 is a second rear perspective view thereof;

FIG. 7 is a right side view; and,

FIG. 8 is a top view thereof.

The broken lines in the figures illustrate the portions of the design that form no part of the claimed design. 

CLAIM The ornamental design for a flat panel speaker, as shown and described. 